Rb Sr dating of the Yatsushiro granite and gneiss,Kyushu, Japan |
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| Authors: | Susumu Nohda |
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| Institution: | Department of Geology and Mineralogy, Faculty of Science, University of Kyoto, Kyoto, Japan |
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| Abstract: | RbSr measurements on the Yatsushiro granite and gneiss, which had been considered stratigraphically to be of possible Precambrian age, are reported. The whole rock isochron for the granite gives an age of 352 ± 8 my with a low initial87Sr/86Sr ratio of 0.7037 ± 0.0006. Data for constituent minerals of the granites are dispersed irregularly around the whole rock isochron (possibly by later tectonic events). For the gneiss, a metamorphic event around 410 my is indicated by the muscovite RbSr ages. The present results do not support the possibility that the Yatsushiro granite and gneiss are Precambrian in age. |
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